A new control scheme for modular converters

Modular converters are gaining importance for various high power applications. The main dynamics of the converter lies in maintaining equal and constant voltage across all the capacitors used in sub modules. This paper discusses the application of unique control scheme, 1D Space Vector Modulation (SVM) scheme, in modular converters. Compared with earlier SVM methods, the proposed scheme simplifies the detection of nearest two vectors and the generation of switching sequences, and therefore is computationally more efficient. Since, the scheme uses phase voltage as a reference; it can be easily extended to large level-number applications of Modular Converters. Experimental results have been presented to validate the proposed control scheme for modular converters.